Quarterly report pursuant to Section 13 or 15(d)

Securities - Narrative (Details)

v3.19.3
Securities - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 244,872 $ 229,366
Debt securities, available-for-sale, realized gain 228  
Debt securities, available-for-sale, realized loss 112  
Debt securities, available-for-sale, net realized gain (loss) 116  
Debt securities, available-for-sale, income tax expense in realized gain (loss) 28  
Other assets    
Debt Securities, Available-for-sale [Line Items]    
Equity securities, fair value 853  
Equity securities, cost 183  
Time Deposits Placed and Other Short-term Investments    
Debt Securities, Available-for-sale [Line Items]    
Time deposits placed and other short-term investments 1,400  
Nonperforming Financing Receivable    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 11 $ 11
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Accumulated net unrealized loss on AFS debt securities 2,300  
Accumulated other comprehensive income tax expense (benefit) $ 761